First let’s test this small piece of code

echo 'This is:'.$a;

What will this code display? “This is 022” or “This is 22”? None.
This will display “This is 18”. Why 18? Because numbers beginning with 0 are considered as octadecimal numbers.
Let’s convert 022 to decimal numbers.
As 22todecimal=2*8^1+2*8^0=16+2=18.
That’s why the codepiece displays 18.

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